Rename project to sacredK

sacred_re.dll/.exe/.ini/.log/_crash files are now sacredK.*; inventory saves
with the old "sacred_re.inventory" format id still load.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/shared-chest.md

@@ -55,7 +55,7 @@ was empty after loading another character (in-game saves don't call saveHero).
   the chest drew at the wrong spot after some loads. Both tabs' grids are put
   back to the constructor's values every tick and on each tab switch.
 - `MoveItem` from/to 0x11 while the shared tab is open moves from/to it.
-- File: `{"format": "sacred_re.shared_chest", "version": 1, "items": [{cell,
+- File: `{"format": "sacredK.shared_chest", "version": 1, "items": [{cell,
   w, h, type, data (hex of vf1c), count}]}`; written after each successful
   `saveHero` and after each save-game write (in-game saves don't call saveHero;
   via a temp file), read on the first engine tick with a hero after a session